Manufacture of metallic compounds.



IE STATES PATEN FIEE.

SAMUEL PARFITT, or CARDIFF, ENGLAND.

MANUFACTURE F wirzraruo oomPooNns.

Specification of Letters Patent.

Patented April 17, 1906.

Application filed May 25,1903. Serial No. 158,638.

To all whom it may concern:

Be it known that I, SAMUEL PARFITT, a subject of the King of GreatBritain, residing at 33 Partridge road, Cardiff, England, have inventednew and useful Improvements in the Manufacture of Metallic Compounds;and I do hereby declare that the following is a full, clear, and exactdescription of the invention, as will enable others skilled in the artto practice the same.

This invention relates to improvements in the manufacture of metalliccompounds having as their basic or principal constituent decarbonizediron; and the object of the invention is to provide a process or methodof treatment of such compounds whereby the de carbonized iron may behardened with a metal in contradistinction to the use of carbon for suchhardening.

The invention further aims to provide a method of treating metalliccompounds by which a product is obtained which is of great utility andtensile strength andwhich is not so liable to oxidation when exposed tothe elements as those compounds not subjected to the treatment followedin the practice of the invention, nor becomes affected in the presenceof strong solutions of sulfuric acid and similar corrodents.

To the accomplishment of the foregoing ends the invention consists in aprocessor method of treatment, substantially as hereinafter described,and finally pointed out in the appended claim.

In the practice of the invention the iron is melted, preferably, in anopen-hearth regenerative furnace and decarbonized in the usual way, soas to contain as low a grade of carbon as is possible without formingoxids, the purpose being to obtain a body of molten metal containing notmore than one-tenth of one per cent. of carbon. When in such condition,the iron is prepared for the metallic hardening inaccordance with thepresent invention and which is accomplished by adding to the metal aproportionate amount of metal lic aluminium or some salt thereof.Thepreferred quantity of the aluminium is 0.5 per cent., in addition towhich metallic tungsten is also added, the amount of this'being 0.3 percent. powder, and as the hardening materials are combined in the processby the heating of the molten metal they react upon and alter thecondition of the iron and produce a resultant compound of greatstrength.

In addition to the hardening material specified metallic manganese,nickel, and tin may also be employed either separately or altogether.

After the metal has been hardened in the manner described the same iscast into ingots or molds and then rolled into plates or hammered intoforgings in the usual way, or it may be left in'its molded form for usewithout rolling or hammering. 1

Having thus described the invention, what is claimed as new, and desiredto be secured by Letters Patent, is-

In the manufacture of metallic compounds in which decarbonized iron isthe basic or principal constituent, the process which consists inmelting the iron, treating the latter so as to produce a' resultantproduct containing not more than one-tenth of one per cent. of carbon,and addin to the metal metallic aluminium and meta ic tungsten.

Dated this 24th day of April, 1903.

' a SAMUEL PARFI'IT.

witnessesz.

ERNEST L. PHILLIPS, JAMES L. LEMON.

The tungsten is in the form of

